Influence of Graphitization Temperature on Microstructure and Mechanical Property of C/C-SiC Composites with Highly Textured Pyrolytic Carbon

Three-dimensional needled carbon/silicon carbide (C/SiC) composites with pyrolytic carbon interfacial layer were fabricated by precursor pyrolysis. The microstructure and mechanical property of the three-dimensional needled C/SiC composites were investigated. A thin pyrolysis carbon layer (0.2m) was firstly deposited on the surface of carbon fiber as the interfacial layer with C3H6 at 850 °C and 0.1 MPa by chemical vapor infiltration. Polycarbosilane and divinylbenzene were selected as a precursor to silicon carbide ceramics and a cross-linking reagent for PCS, respectively. The density of the composites was 1.94 g cm-3. The flexural strength of the three-dimensional needled C/SiC composites was 135 MPa. The three-dimensional needled C/SiC composites with pyrolytic carbon interfacial layer exhibit good mechanical properties and a typical failure behavior involving fibers pull-out and brittle fracture of sub-bundle.

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Microstructure and Mechanical Property of 3D Textile C/SiC Composites Fabricated by Chemical Vapor Infiltration

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.11-12.81 ◽

2006 ◽

Vol 11-12 ◽

pp. 81-84 ◽

Cited By ~ 3

Author(s):

Dong Lin Zhao ◽

Hong Feng Yin ◽

Fa Luo ◽

Wan Cheng Zhou

Keyword(s):

Mechanical Property ◽

Silicon Carbide ◽

Carbon Fiber ◽

Interfacial Layer ◽

Chemical Vapor ◽

Pyrolytic Carbon ◽

Chemical Vapor Infiltration ◽

Sic Composites ◽

Microstructure And Mechanical Property ◽

Vapor Infiltration

Three dimensional textile carbon fiber reinforced silicon carbide (3D textile C/SiC) composites with pyrolytic carbon interfacial layer were fabricated by chemical vapor infiltration. The microstructure and mechanical property of 3D textile C/SiC composites were investigated. A thin pyrolysis carbon layer (0.2 ± μm) was firstly deposited on the surface of carbon fiber as the interfacial layer with C3H6 at 850°C and 0.1 MPa. Methyltrichlorosilane (CH3SiCl3 or MTS) was used for the deposition of the silicon carbide matrix. The conditions used for SiC deposition were 1100°C, a hydrogen to MTS ratio of 10 and a pressure of 0.1 MPa. The density of the composites was 2.1 g cm-3. The flexural strength of the 3D textile C/SiC composites was 438 MPa. The 3D textile C/SiC composites with pyrolytic carbon interfacial layer exhibit good mechanical properties and a typical failure behavior involving fibers pull-out and brittle fracture of sub-bundle. The real part (ε′) and imaginary part (ε″) of the complex permittivity of the 3D-C/SiC composites are 51.53-52.44 and 41.18-42.08 respectively in the frequency range from 8.2 to 12.4 GHz. The 3D-C/SiC composites would be a good candidate for microwave absorber.

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Microstructure and Mechanical Property of SiCf/SiC and Cf/SiC Composites

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/18/16/162017 ◽

2011 ◽

Vol 18 (16) ◽

pp. 162017 ◽

Cited By ~ 1

Author(s):

S P Lee ◽

K S Cho ◽

H U Lee ◽

J K Lee ◽

D S Bae ◽

...

Keyword(s):

Mechanical Property ◽

Sic Composites ◽

Microstructure And Mechanical Property

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Microstructure and mechanical property of (TiB 2 ‐SiC) agglomerate‐toughened B 4 C‐TiB 2 ‐SiC composites

International Journal of Applied Ceramic Technology ◽

10.1111/ijac.13602 ◽

2020 ◽

Vol 17 (6) ◽

pp. 2569-2579

Author(s):

Shuai Wang ◽

Yangyang Deng ◽

Shuaibo Gao ◽

Mingsheng Yang ◽

Pengfei Xing

Keyword(s):

Mechanical Property ◽

Sic Composites ◽

Microstructure And Mechanical Property

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Effects of Carbon Fiber Architecture on the Microstructure and Mechanical Property of C/C-SiC Composites

Materials Science Forum ◽

10.4028/www.scientific.net/msf.658.133 ◽

2010 ◽

Vol 658 ◽

pp. 133-136 ◽

Cited By ~ 3

Author(s):

Ji Ping Wang ◽

Jian Yong Lou ◽

Zhuo Xu ◽

Zhi Hao Jin ◽

Guan Jun Qiao

Keyword(s):

Mechanical Property ◽

Carbon Fiber ◽

Flexural Strength ◽

Thermal Gradient ◽

Chemical Vapor ◽

Chemical Vapor Infiltration ◽

Fiber Architecture ◽

Carbon Fiber Felt ◽

Sic Composites ◽

Microstructure And Mechanical Property

C/C-SiC composites were rapidly fabricated by a two-steps processing. Firstly a short-cut carbon fiber felt (SC) and a 2D carbon fiber felt (2D) were densified to C/C composites by a thermal gradient chemical vapor infiltration (CVI) method with vaporized kerosene as a precursor in 2h, 3h, 4h and 5h, respectively. Then the C/C composites were infiltrated and reacted with melting silicon to obtain C/C-SiC composites. The results show that, with increase of the CVI time, the densities of the two types of C/C-SiC composites decrease in the range of 2.28g/cm3 to 2.00g/cm3; their porosities increase ranging from 1.3% to 7.5%; the contents of the β-SiC and the unreacted Si phases in the composites decline. The flexural strength of the 2D_C/C-SiC composite is much higher than that of the SC_C/C-SiC composite when prepared in the same condition.

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Mechanical Properties of C/SiC Composites via Precursor Pyrolysis with Pretreated Carbon Fiber

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.336-338.1245 ◽

2007 ◽

Vol 336-338 ◽

pp. 1245-1247 ◽

Cited By ~ 1

Author(s):

Song Wang ◽

Zhao Hui Chen ◽

Fan Li ◽

Hai Feng Hu

Keyword(s):

Mechanical Properties ◽

Mechanical Property ◽

Fracture Toughness ◽

Carbon Fiber ◽

Thermal Treatment ◽

Carbon Coating ◽

Pyrolytic Carbon ◽

Pyrolysis Process ◽

Sic Composites

3D C/SiC composites were fabricated by polycarbosilane (PCS) infiltration and pyrolysis process. The influence of pretreatment of carbon fiber, including pyrolytic carbon coating and thermal treatment, on mechanical properties of C/SiC composites was investigated. The results showed that the composites without fiber pretreatment had a flexural strength of 154MPa and a fracture toughness of 4.8 MPa•m1/2, while those with carbon coating or thermal treatment had much higher strength and toughness, that is, more than 400MPa and 15MPa•m1/2 respectively. Weak interfacial bonding and better in-situ strength of carbon fiber were main reasons for mechanical property improvement with pretreated carbon fiber.

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